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Investments - Hybrid Securities (Detail) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | --- | ---
Hybrid Instruments [Line Items] |  |  |
Hybrid securities | $ 1,338 | $ 1,088 | $ 1,009
Corporate and other debt securities |  |  |
Hybrid Instruments [Line Items] |  |  |
Hybrid securities | 696 | 608 | 637
Residential mortgage-backed securities |  |  |
Hybrid Instruments [Line Items] |  |  |
Hybrid securities | 642 | 479 | 369
Other asset-backed securities |  |  |
Hybrid Instruments [Line Items] |  |  |
Hybrid securities | $ 0 | $ 1 | $ 3

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